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iommu: Switch gather->end to the inclusive end
Currently gather->end is "unsigned long" which may be overflow in
arch32 in the corner case: 0xfff00000 + 0x100000(iova + size).
Although it doesn't affect the size(end - start), it affects the checking
"gather->end < end"
This patch changes this "end" to the real end address
(end = start + size - 1). Correspondingly, update the length to
"end - start + 1".
Fixes: a7d20dc19d
("iommu: Introduce struct iommu_iotlb_gather for batching TLB flushes")
Signed-off-by: Yong Wu <yong.wu@mediatek.com>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Acked-by: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20210107122909.16317-5-yong.wu@mediatek.com
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
parent
20143451ef
commit
862c3715de
4 changed files with 5 additions and 5 deletions
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@ -2280,7 +2280,7 @@ static void arm_smmu_iotlb_sync(struct iommu_domain *domain,
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{
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struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
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arm_smmu_tlb_inv_range(gather->start, gather->end - gather->start,
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arm_smmu_tlb_inv_range(gather->start, gather->end - gather->start + 1,
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gather->pgsize, true, smmu_domain);
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}
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@ -443,7 +443,7 @@ static void mtk_iommu_iotlb_sync(struct iommu_domain *domain,
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struct iommu_iotlb_gather *gather)
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{
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struct mtk_iommu_data *data = mtk_iommu_get_m4u_data();
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size_t length = gather->end - gather->start;
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size_t length = gather->end - gather->start + 1;
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if (gather->start == ULONG_MAX)
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return;
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@ -270,7 +270,7 @@ static void gart_iommu_sync_map(struct iommu_domain *domain, unsigned long iova,
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static void gart_iommu_sync(struct iommu_domain *domain,
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struct iommu_iotlb_gather *gather)
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{
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size_t length = gather->end - gather->start;
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size_t length = gather->end - gather->start + 1;
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gart_iommu_sync_map(domain, gather->start, length);
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}
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@ -170,7 +170,7 @@ enum iommu_dev_features {
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* struct iommu_iotlb_gather - Range information for a pending IOTLB flush
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*
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* @start: IOVA representing the start of the range to be flushed
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* @end: IOVA representing the end of the range to be flushed (exclusive)
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* @end: IOVA representing the end of the range to be flushed (inclusive)
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* @pgsize: The interval at which to perform the flush
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*
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* This structure is intended to be updated by multiple calls to the
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@ -539,7 +539,7 @@ static inline void iommu_iotlb_gather_add_page(struct iommu_domain *domain,
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struct iommu_iotlb_gather *gather,
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unsigned long iova, size_t size)
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{
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unsigned long start = iova, end = start + size;
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unsigned long start = iova, end = start + size - 1;
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/*
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* If the new page is disjoint from the current range or is mapped at
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